The first line is a read-only display area.
第一行是一个只读显示区域。
He opened up the little card to see what it would say, And as he read the first line it said "Happy Father's Day!"
他打开贺卡看里面写的是什么,第一行便是“父亲节快乐!”
The first line USES the val keyword to declare a read-only variable named book.
在第一行我们使用了val关键字来声明一个只读变量book。
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